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<?hh class B { public function doB() : string { return "b"; } } class C extends B { public function doC() : string { return "c"; } } function foo(Vector<B> $vec) { $vec->add(new B()); } function bar(Vector<C> $vec) { foo($vec); } $v = new Vector<C>(); bar($v);
Output for git.master, git.master_jit, rfc.property-hooks
<?hh class B { public function doB() : string { return "b"; } } class C extends B { public function doC() : string { return "c"; } } function foo(Vector<B> $vec) { $vec->add(new B()); } function bar(Vector<C> $vec) { foo($vec); } $v = new Vector<C>(); bar($v);

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